The music on this piece is from 3 movements of Mussorgsky's "Pictures at an Exhibition" ten-piano suite.
"Promenade" [from start to 1:38]
"Hut on Fowl's Legs (Baba Yaga)" [from 1:38 to 3:45]
"The Great Gate of Kiev" [from 3:45 to end]
Do you notice the picture on the bass drums? It is a drawing of the Great Gate of Kiev complete with a bell tower to its right.
Animusic 2 ~ Cathedral Pictures